Thread: how to feed audio to headunit and shut PC off

I'll start with the audio first. I have an Alpine headunit with no aux-in. I do have two amps though, one for subs and one for mids and highs. Can I just split (with Y cable) the signal into the amps directly, or will that cause problems. Also, is there a way, short of buying a new headunit, to be able to control the sound with my existing Alpine?

Now for number 2: I have a DC-DC converter and already have a power block in my trunk thanks to the amp setup. The PC has an AT motherboard that doesn't shut off when win98 shuts down. Is there a way to get the PC to turn on and off without buying a shutdown unit?? I'd rather not run the power all the way to the dash just to put a switch in on the DC-DC line. Thanks!